The lecture is dedicated to the mechanics of a sailing vessel. Listeners will learn how a sailing boat and the sails themselves are constructed, why rigging is important, and how one can move not only with the wind but also at an angle. The lecture opens a series dedicated to sailing yacht management. It will be useful for those dreaming of independent outings on the water, choosing a new hobby, or simply enjoying understanding how complex things work. The course instructor, Igor Goncharenko, will explain in simple terms what beating and running are, how the course is related to maximum speed, and why sailors need polar diagrams. Through such examples, it becomes clear that managing a sail requires practice, observation, and knowledge of physics. Listeners will be able to ask the instructor questions and clarify any unclear points. If you don't know where to walk in Moscow, visit KudaGo.